Taco 4 Zone Expandable Switching Relay w/ Priority, SR504-EXP-4

Taco 4 Zone Expandable Switching Relay with Priority SR504-EXP-4, whether you want to expand up to 120 zones or utilize the advanced features of the Add-on Power Controls, Taco -EXP controls allow for a simple integration of advanced features. Energy savings and increased comfort can be easily achieved in any new or existing system by plugging a PC700 Outdoor Reset Power Control into the SR501-EXP

Taco Switching Relays combine clearly labeled PC board layouts with advanced features that allow for total system customization. Whether using basic priority switching or the advanced features of the -EXP controls, the job is made easy. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. All switching relays are UL listed, are compatible with conventional and programmable thermostats.

Technical Information

Taco-SR504-EXP-4-Brochure

Taco-SR504-EXP-4-Installation Instructions

Taco Wiring Guide

Features

Front Diagnostic Lights
Simplified Wiring
Premium Sealed Relays
Add-on Power Control Plug
Built-in; Post Purge and Pump Exercise Functions
Switchable Primary Circulator Output
Two boiler contacts, utilizes full functionality of Mod-Con boilers
Expandable to 20 Zoning Panels (120 zones if all are 6 zone panels)
Interface with -EXP Zone Valve Controls
Fuse Protected (with spare)
100% Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for hard wired thermostats
Field Replaceable Transformer
UL Approved
Extended 3 Year Warranty